Cannibal Corpse guitarist Pat O'Brien will be filling in for Exodus guitarist Gary Holt who was filling in for Slayer guitarist Jeff Hanneman who is recovering from an emergency surgery on his right arm after contracting necrotizing fasciitis (commonly known as flesh-eating disease), possibly caused by a spider bite. Got all that?

The Slayer camp released the following message: "Cannibal Corpse guitarist Pat O'Brien will fill in for Exodus' Gary Holt when Holt leaves the Slayer European tour to play with his own band Exodus at the Estadio Nacional in Santiago, Chile on April 4. Holt has been filling in for Slayer guitarist Jeff Hanneman since the tour kicked off February 26 in Australia.

Holt's last show with Slayer will be April 4 in Padova, Italy;, O'Brien will join the band for the April 6 show in Croatia, and will finish the European dates with Slayer that wrap up on April 14 in Holland.

Hanneman has amazed his doctors with his speedy recovery from an infection thought to have been caused by a spider bite. Following surgery on his right arm, he continues his physical therapy and has already been practicing with his guitar."